F. because electronegativity generally increases as you move from left to right across a periodic table, and F is farther right than O
Answer:
Dolphins use a method called echolocation to detect things such as obstacles and prey in the water. If a dolphin swimming in seawater at 25°C sends a 220-dB click with a frequency of 120.0 Hz, and then detects the reflection of the click exactly one-twentieth of a second later, approximately how far away is the object?
UV rays, gamma rays, and x rays
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